Magnetofingerprints of superconducting films: Vortex dynamics and mesoscopic-scale disorder

Edmund R. Nowak, N. E. Israeloff, A. M. Goldman

Research output: Contribution to journalArticle

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Abstract

The variations of voltage and voltage noise with magnetic field in c-axis-oriented DyBa2Cu3O7-δ thin films exhibit reproducible, microstructure-dependent ''magnetofingerprints'' (MF's). The MF's can be scrambled with the reversal of the direction of the Lorentz force on field-induced vortices. Analysis of the noise suggests a strong dependence of the local free-energy landscape on vortex density similar to global frustration effects found in periodic superconducting networks. Above fields which roughly match vortex separation with mesoscopic-scale disorder in the films the noise and the fine structure of the MF's are suppressed, suggesting a crossover to a more weakly pinned vortex-liquid regime.

Original languageEnglish (US)
Pages (from-to)10047-10050
Number of pages4
JournalPhysical Review B
Volume49
Issue number14
DOIs
StatePublished - Jan 1 1994

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